Grate-bar



L. ROLL.

GRATE BAR.'

(No Model.)

Patented'F'eb. 2, 1886.

O O O G O O T lVAl/AlZ/Jl INVE/VTOR N. PEI'ERQ. Phvlwmivognpher, Wanhington, u c,

EATENT OFFICE.

LEONARD ROLL, OF \VILKES-BARRE, PENNSYLVANIA.

GRATE-BAR.

.ePE-CiPI JLSIQ forming part of Letters Patent No. 335,540, dated February 2, 1886.

Application filed November 19, 1885.

To aZl whom it may concern:

Be it known that I, LEONARD ROLL, a citizen of the United States, residing at \Vilkes- Barr, in the county of Luzerne and State of Pennsylvania, have invented a new and useful Improvement in Grate-Ba rs, of which the following is a specification.

The objects of my invention are, first, to provide a grate-bar with expansion top plates with lateral supports to prevent them from warping upward; second, to provide a gratebar with a rib or bearing-bar which shall be stronger than the ordinary form without a corresponding increase of material. I attain these objects in the grate-bar illustrated in the accompanying drawings, in which Figure 1 is a plan view. Fig. 2 is a side elevation. Fig. 3 is a cross-section showing a joint hereinafter referred to. Fig. 4 is a crosssection on line 1 and 2. Fig. 5 is a crosssection on line 3 and l, and Fig. 6 is an end view.

Similarletters refer to similar partsthroughout the several views.

My invention relates to a grate-bar of which the top plate may be of any of the usual forms; but the supporting-rib or bearing-bar is of the form of an annular elongated ellipse hung 011 its major axis, and may be entirely separate from the top plate. To the ends ofthe rib are cast solid with it the bearing-heads g and h, on which the bar is hung and on which is formed a dovetail which engages with a suitable recess in the top plate, a, formed by the lug c and 0; also in the upper side of the heads {1 and h are formed the recesses lc, that tle air may have all possible access to the top plate. Similar recesses, j and Z, are formed in all supporting brackets hereinafter referred to.

arating the top plate from the rib with an interlocking loose joint is further illustrated in Serial No. 183,365. (No model.)

Fig. 3. This is a modified form of said joint and may be used throughout the bar, instead of that shown in the other figures. At the center of the length of the rib the top plate may be cast solid with it through the bracket 6.

I do not presume that this method of pro viding for expansion in the top plate of a grate-bar independent to that of the rib is new, but that t l e addi ion of the brackets f and lugs (l are new and a necrssity, in order to prevent Warping of the top plate, especially in long bars, sincethese have a tendency without such support to bend upward, notwithstanding their free longitudinal expansion. These brackets may be located at one or more points between the center and the ends of the bar, as circumstances require. I also think that the form and construction of the rib Z) is new in a grate-bur, and it is seen from the illustration that its form is the strongest for an equal amount of material, since the resistances to lateral stress are the extremetensile and compression from the neutral axis, and with the bracketsf acting as struts give it a strength far beyond that obtainable in the usual form of rib from a greater amount of material.

Having described my invention, and being awarethat gratebars have been made in which expansion has been provided for, as above described, I do not claim such wholly; but

\Vhat I do claim, and desire to secure by Letters Patent, is-

1. In the within-described grate-bar, the rib I), having the form of an annular elongated ellipse to which are cast solid the bearingheads 9 and h, as described.

2. In the within-described grate-bar, the bracketsf and c to form struts in the rib b, and supports for the top plate, a, in combination with the rib b and bearing-headsg and h, as described.

3. In the within described grate-bar, the combination, with a top plate, a, of a rib, b, bearing-heads g and h, and brackets f and lugs d, substantially as described.

LEONARD ROLL.

\Vitn esses:

LOUIS L. Bevan, S. C. STRUTHERS. 

